When Fia had mentioned about using a tracking spell, she had momentarily forgot that Serena was capable of tracking Bane through their bond. She watched Serena got a link forged to finding Bane, as did the others and when it was forged, she looked on as the shadows came to Serena's aid. 

Kay noticed how John was smirking at the shadows coming to Serena's aid and she really hoped that this wouldn't be the start of John losing control and going rogue in this rescue mission, but she was also aware that there was still a lot she was yet to learn about John. It just unnerved her slightly, but she wouldn't let it show to everyone in the group. "We're ready when you are to go Serena" she told her.